Inject them if you want (I usually don't). Cook them like any other poultry - I usually do poultry a bit hotter (around 275 or higher). Use your favorite poultry rub on the outside - and use olive oil (I use PAM, but then I'm usually doing 1-10 cases of turkey) or other oil to help the rub to stick and help brown the skin.
How long they cook depends on the size of the turkey legs. The last ones I did were about 2# each so took 2 hours or so.
Relax - they are poultry!!
Southern Brethren BBQ Competition Team
"It's all about getting paid!" - Myron Mixon
"I love being hated in my hometown!" - David Hair
KingFisher Gator Rotisserie cooker, WSM, Stainless 5 burner with IR gas grill, Turkey Fryer, Weber JD Commemorative grill, slightly used Bandera chamber for future use as a cold smoker, Masterbuilt 40" insulated ELECTRIC smoker